Guild Wars. It's a pretty popular MMO, and the Charr are a warlike, feline race. It's currently on Guild Wars 2, and it's only a one-time purchase if you're interested in trying out a new MMO. I thought it was fun, but lacked overall direction and urgency to continue playing. But yeah, GW stands for Guild Wars. Probably went on a little long of a description there.

P.S. I'm not trying to endorse the game or anything, don't kill me for it. >.>